I tweaked the file : /usr/share/aclocal/gtkglextmm-1.2.m4 as was suggested in the bug reports you referred to (by replacing line 225 - AC_DEFUN(AC_GTKGLEXTMM_SUPPORTS_MULTIHEAD, by : AC_DEFUN(AC_GTKGLEXTMM_SUPPORTS_MULTIHEAD, butwithout any effect, that is,the command 'make' still produces the same error as before.

In your last but one post you made three suggestions. If you look at the third line where you refer to a link : do you know the complete link,because, in its present shape, with the dots in between, it does not lead to the target.